All the RMW's I have seen, crease like that, I think there might be something else to it. RMW's are constructed quite differently than most chelsea's (it is my understanding that they have that lengthwise ridge when new because of the artisan? way that they are made). I can't understand how if the elastics are snug around your ankle you would be able to avoid those creases at the front, just below the ankle, as your ankle bend there and would have to bend the leather. If they were flapping around your ankle or sliding up and down you would not get those creases though. At least thats what seems logical to me.
That said, knowledge wise I'm in no position to contradict DW.
Besides I actually like the look of them when they get all creased up, I understand that you wouldn't want it in a dress boots, but if you are wearing them casually I thinks its a nice look.